U.S. patent application number 11/164364 was filed with the patent office on 2007-02-08 for antenna structure.
Invention is credited to Chia-Tien Li, Feng-Chi Eddie Tsai.
Application Number | 20070030197 11/164364 |
Document ID | / |
Family ID | 37717183 |
Filed Date | 2007-02-08 |
United States Patent
Application |
20070030197 |
Kind Code |
A1 |
Tsai; Feng-Chi Eddie ; et
al. |
February 8, 2007 |
Antenna Structure
Abstract
An antenna includes a ground portion, a radiating element, and
an interconnecting element connected to the ground portion and the
radiating element. The radiating element includes a first radiating
trace including a turning point connected to a first segment and a
second segment of the first radiating trace, and a second radiating
trace connected to the second segment of the first radiating
trace.
Inventors: |
Tsai; Feng-Chi Eddie;
(Taipei Hsien, TW) ; Li; Chia-Tien; (Taipei Hsien,
TW) |
Correspondence
Address: |
NORTH AMERICA INTELLECTUAL PROPERTY CORPORATION
P.O. BOX 506
MERRIFIELD
VA
22116
US
|
Family ID: |
37717183 |
Appl. No.: |
11/164364 |
Filed: |
November 21, 2005 |
Current U.S.
Class: |
343/700MS ;
343/702 |
Current CPC
Class: |
H01Q 5/371 20150115;
H01Q 9/42 20130101 |
Class at
Publication: |
343/700.0MS ;
343/702 |
International
Class: |
H01Q 1/38 20060101
H01Q001/38 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 8, 2005 |
TW |
094126825 |
Claims
1. An antenna comprising: a ground portion; a radiating element
comprising: a first radiating trace including a bended portion
connected to a first segment and a second segment of the first
radiating trace; and a second radiating trace connected to the
second segment of the first radiating trace; and an interconnecting
element connected to the ground portion and the radiating
element.
2. The antenna of claim 1 wherein the interconnecting element
includes at least one turning point to subdivide the
interconnecting element into a plurality of subsections.
3. The antenna of claim 1 wherein the first segment of the first
radiating trace extends away from the grounded portion.
4. The antenna of claim 1 wherein the first segment of the first
radiating trace includes a turning point to subdivide the first
radiating trace into a plurality of segments.
5. The antenna of claim 1 wherein the interconnecting element is
connected to the first radiating trace and the second radiating
trace.
6. The antenna of claim 1 wherein a surface of the first segment
subtends an angle with a surface of the ground portion.
7. The antenna of claim 1 wherein the first radiating trace further
includes a third segment bent from the first segment extending
toward the second radiating trace.
8. The antenna of claim 1 wherein a width of the first segment is
larger than a width of the second segment.
9. An antenna comprising: a ground portion; a radiating element
comprising: a first radiating trace including a first bended
portion connected to a first segment and a second segment of the
first radiating trace; and a second radiating trace connected to
the second segment of the first radiating trace, the second
radiating trace includes a second bended portion connected to a
third segment and a fourth segment of the second radiating trace;
and an interconnecting element connected to the ground portion and
the radiating element.
10. The antenna of claim 9 wherein the third segment of the second
radiating trace is connected to the second segment of the first
radiating.
11. The antenna of claim 9 wherein the interconnecting element
includes a first turning point to subdivide the interconnecting
element into a plurality of segments.
12. The antenna of claim 9 wherein the fourth segment of the second
radiating trace extends away from the ground portion.
13. The antenna of claim 9 wherein the fourth segment of the first
radiating trace includes a second turning point to subdivide the
first radiating trace into a plurality of segments.
14. The antenna of claim 9 wherein the interconnecting element is
connected to the first radiating trace and the second radiating
trace of the radiating element.
15. The antenna of claim 9 wherein a surface of the first segment
subtends an angle with a surface of the ground portion.
16. The antenna of claim 9 wherein a surface of the fourth segment
subtends an angle with a surface of the ground portion.
17. The antenna of claim 9 wherein a width of the fourth segment is
larger than a width of the third segment.
18. An antenna comprising: a ground portion; a radiating element
including a bended portion connected to a first segment and a
second segment of the radiating element; and an interconnecting
element connected to the ground portion and the second segment of
the radiating element; wherein the first segment extends in a
direction substantially parallel to the second segment.
19. The antenna of claim 18 wherein the first segment of the
radiating element extends away from the ground portion.
20. The antenna of claim 18 wherein a surface of the first segment
subtends an angle with a surface of the ground portion.
21. The antenna of claim 18 wherein a width of the first segment is
larger than a width of the second segment.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention provides an antenna, and more specifically, a
small multi-frequency antenna.
[0003] 2. Description of the Prior Art
[0004] In the prior art, an inverted F antenna is usually used to
realize a radio signal switch.
[0005] As those skilled in the art know, the basic inverted F
antenna includes a radiating element. One end of the radiating
element connects with a ground portion, and the middle of the
radiating element is used as the feeding point of the signal. The
ground portion and the signal feeding point form two transverse
portions of an F shape (The radiating element becomes the back of
the F shape.). The length of the antenna has a relationship with a
radiating frequency of transmitting and receiving. However, the
simple inverted F antenna only supports a single-frequency for
transmitting and receiving radio signals. It cannot integrate
multiple frequencies for transmitting and receiving radio signals.
The length of the radiating element is relatively long, so compact
size requirements of the information industry cannot be met. In
addition, U.S. Pat. No. 6,861,986 provides a kind of
multiple-frequency application for an inverted F antenna, however,
the antenna uses two ends in a straight line radiating element to
radiate two frequencies. Thus, the size of the radiating element is
not compact.
SUMMARY OF THE INVENTION
[0006] It is therefore a primary objective of the claimed invention
to provide a multiple-frequency antenna that can not only support
multiple-frequency transmitting and receiving of radio signals, but
that also has compact size without having an effect on the
performance of antenna.
[0007] According to the claimed invention, the antenna includes a
radiating element, an interconnecting element, and a ground
portion. The radiating element comprises two radiating traces,
wherein at least a radiating trace includes a turning point to
subdivide the trace into a plurality of segments. Hence, the
radiating element can be viewed as an element including a plurality
of segments. An interconnecting element is connected to the ground
portion and the radiating element. The interconnecting element is
used to receive an input/output signal, and includes a plurality of
turning points to subdivide the interconnecting element into a
plurality of subsections. The segment of the radiating trace is
opposite to the position of the interconnecting element and extends
away from the grounded portion.
[0008] These and other objectives of the present invention will no
doubt become obvious to those of ordinary skill in the art after
reading the following detailed description of the preferred
embodiment that is illustrated in the various figures and
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIGS. 1 to 8 show a plurality of antennas of embodiments of
the present invention.
DETAILED DESCRIPTION
[0010] Please refer to FIG. 1. FIG. 1 shows an embodiment of the
antenna 10 according to the present invention. The antenna 10
includes a ground portion 12, an interconnecting element 14, and a
radiating element 16. Each component can be formed by an
electrically conductive surface, for example, by a conductive layer
in a printed circuit board. As FIG. 1 shows, the ground portion 12
is used to connect with ground, the radiating element 16 and the
ground port 12 are separated but mutually connected by the
interconnecting element 14 disposed between. The radiating element
16 is divided into two radiating traces, wherein a cross-hatched
region is a first radiating trace L1, and a single-hatched region
is a second radiating trace L2. The two radiating traces L1 and L2
use the interconnecting element 14 to connect with the ground
portion 12. In the embodiment of FIG. 1, the interconnecting
element 14 has two bent segments, so the signal can input to and
output from the antenna 10 by one feeding point of signals.
[0011] In other words, a signal line is connected to feeding point
S. As FIG. 1 shows, the two radiating traces L1 and L2 of the
radiating element 16 both have bends. In the first radiating trace
L1, the region parallel with the ground portion 12 is a second
segment 18A, and the region extending above along a bended portion
18C is a first segment 18B. Similarly, in the second radiating
trace L2, the portion parallel to the ground portion 12 is a third
segment 18D, and the portion extending above along a bended portion
18F is a fourth segment 18E. Owing to the bent shape design of the
radiating element of the invention, the size and the occupied
volume of the radiating element is compact and efficient.
[0012] As FIG. 1 shows, based on the interconnecting portion J, the
antenna 10 can resonate two different frequencies by means of the
left element and the right element of the radiating element, and
the antenna 10 of the invention can integrate the transmitting and
receiving of signals. When realizing the antenna 10, the operating
frequencies of the antenna 10 can be adjusted by changing the
lengths of the radiating traces L1 and L2. From FIG. 1, we can see
that the radiating traces L1 and L2 are bent in reverse directions,
so that the invention has compact size radiating elements.
[0013] In the embodiment of the FIG. 1, the two radiating traces L1
and L2 of the radiating element 16 both have bent structure.
However, the invention also provides an embodiment with one
radiating trace bent. Please refer FIG. 2. FIG. 2 is an embodiment
of an antenna 20 of the invention. Similar to the antenna 10 of
FIG. 1, the antenna 20 of FIG. 2 also has ground portion 22, a bent
interconnecting element 24, and a radiating element 26. But only
the left radiating trace L1 (cross-hatched portion) of the antenna
20 forms a reverse-bent structure, the right radiating trace L2
(single-hatched portion) has a segment paralleling to the ground
portion. The straight portion still has the effect of resonating,
and the antenna 20 can resonate two frequencies.
[0014] In the embodiment of FIG. 1, the first radiating trace L1 of
the first radiating element 16 is bent into two sub-segments.
However, according to the invention, each radiating trace can have
more bended portions. Please refer to the embodiment of FIG. 3,
which shows an antenna 30. Similar to the antenna 10 of FIG. 1, the
antenna 30 also has a ground portion 32, an interconnecting element
34, and a radiating element 36. However, in the left radiating
trace L1 (cross-hatched portion), a first element 38 is divided
into four segments by three turning points. As FIG. 1 shows, the
antenna 30 can radiate two kinds of different frequencies with
radiating traces L1 and L2.
[0015] In the embodiments of FIG. 1 to FIG. 3, each segment is
extending in an up direction, and is not extending in a down
direction between a radiating element and ground portion. Besides,
a width of each segment can be different. For example, in the
embodiment of FIG. 1, the width of the segment 18D is larger than
the width of the segment 18E. According to simulation and test, the
antennas of FIG. 1 to FIG. 3 of the invention can all achieve
omni-directional radiating field patterns, and have good bandwidth
in the two radiating frequencies.
[0016] FIG. 4 shows another embodiment 40 of an antenna of the
present invention. An antenna 40 includes a ground portion 42, an
interconnecting element 44 and a radiating element 46. In this
embodiment, the interconnecting element is bent into three segments
by two turning points. The signal of a transmission line can be fed
in from a feeding line. Based on an interconnecting portion J, the
radiating element 48 can resonate two different frequencies by
means of the left element L1 and the right element L2 of the
radiating element 48.
[0017] FIGS. 5 and 6 show two embodiments. Similar to the antenna
40 of FIG. 4, an antenna 50 of FIG. 5 includes a ground portion 52,
an interconnecting element 54, and a radiating element 56. The two
radiating traces of the radiating element 58 both have bended
portions. An antenna 60 of FIG. 6 includes a ground portion 62, an
interconnecting element 64 and a radiating element 66. The left
radiating trace of the radiating element 66 has a plurality of
turning points to subdivide the left radiating trace into a
plurality of segments.
[0018] In FIG. 1 to FIG. 6, each antenna is designed for the aim of
two frequencies. However, the spirit of the invention can also
apply to a single-frequency inverted F antenna for reducing the
size by way of bends. Regarding this kind of application, please
refer FIG. 7, which shows an application of a single frequency
antenna 60 of the invention. An antenna 70 includes a ground
portion 72, an interconnecting element 74 and a radiating element
76. The right portion of the radiating element 76 is bent for
compacting the size of the radiating element 76.
[0019] According to the invention, a ground portion, an
interconnecting element, and a bent radiating element can be
coplanar and, for example, formed in a printed circuit board.
However, the antenna can also be of a three-dimensional and
non-coplanar type. Please refer to FIG. 8, which shows another
embodiment. A dual-band antenna 80 has a ground portion 82, an
interconnecting element 84, and a radiating element 86. Two
radiating traces of the radiating element 88 each have a structure
of bent shape. It is worth mentioning that a part of a segment of
the turning point is not coplanar with the ground portion 82 and
forms an angle with the ground portion 82. This non-coplanar part
makes the antenna 80 a three-dimensional antenna.
[0020] In summary, the antenna of the present invention has a bent
radiating element which means that the radiating element is of
compact size. Compared with the prior art, the antenna of the
present invention can transmit and receive electromagnetic waves of
multiple frequencies, has a compact size, has parameters that are
not adversely influenced, achieves an omni-directional radiating
field pattern, and has good bandwidth in each frequency.
[0021] Those skilled in the art will readily observe that numerous
modifications and alterations of the device and method may be made
while retaining the teachings of the invention. Accordingly, the
above disclosure should be construed as limited only by the metes
and bounds of the appended claims.
* * * * *